Synchronizing apparatus for synchronizing audio signal with video signal

Abstract

A synchronizing apparatus includes an audio signal processing counter which is preset such that 735 or 736 samples of audio data exist in the vertical synchronizing signal of the video signal, such that the video and audio data are synchronized with each other within one field. Wherein a standard video signal is synchronized with the audio signal sampled by the clock and having a sampling frequency different from that of the video signal. In this synchronizing apparatus, audio signal processing counters (12), (14), (19a), (19b), (19) are preset so that 735 or 736 samples of audio data may exist in a vertical synchronizing signal of the standard video signal.

What is claimed is: 
     
       1. A synchronizing apparatus for synchronizing an audio signal with a standard video signal, a sampling frequency of said audio signal differing from a sampling frequency of said standard video signal, comprising: a memory;   counter means for outputting a count signal representing a count value; and   first and second frequency dividers each continuously receiving a signal having a frequency equal to the sampling frequency of said audio signal for continuously presetting two respective preset values of n and n+1 and supplying said preset values to said memory, said preset values of n and n+1 representing a number of samples of said audio signal to be inserted into a vertical interval of said video signal, wherein said memory is adapted for memorizing said audio signal and outputting said audio signal according to said count signal and said preset values, whereby said audio signal synchronized with said standard video signal is read out from said memory.   
     
     
       2. A synchronizing apparatus according to claim 1, wherein said first and second frequency dividers selectively continuously preset said preset values of n and n+1 and supply said preset values to said memory according to a difference between an input timing of a vertical synchronizing signal of said standard video signal fed thereto and an input timing of a final signal from said counter means. 
     
     
       3. A synchronizing apparatus according to claim 1, wherein said standard video signal is an NTSC video signal. 
     
     
       4. A synchronizing apparatus according to claim 1, wherein said sampling frequency of said audio signal is 44.1 kHz. 
     
     
       5. A synchronizing apparatus for synchronizing an audio signal with a standard video signal, a sampling frequency of said audio signal differing from a sampling frequency of said standard video signal, comprising: synchronizing means;   counter means for outputting a count signal representing a count value; and   first and second frequency dividers each continuously receiving a signal having a frequency equal to the sampling frequency of the audio signal for continuously presetting two respective preset values of n and n+1 and supplying said preset values to said synchronizing means, said preset values of n and n+1 representing a number of samples of said audio signal to be inserted into a vertical interval of said standard video signal;   said synchronizing means being adapted for synchronizing said audio signal with said standard video signal according to said count signal and said preset values.   
     
     
       6. A synchronizing apparatus according to claim 5, wherein said first and second frequency dividers selectively continuously preset said preset values of n and n+1 and supply said preset values to said synchronizing means according to a difference between an input timing of a vertical synchronizing signal of said standard video signal and an input timing of a final signal from said counter means